D, Embryo with lateral torsion and an endogastric shell.
But ultimately the coil becomes ventral or endogastric, in consequence of the second torsion movement then apparent.
Next, the shell, the coil of which was at first exogastric, being also included in this rotation through 180Ã‚°, exhibits an endogastric coiling (fig.
The shell then rotates towards the left side through 180Ã‚°, so that it becomes ventral or endogastric (fig.
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